How does rising atmospheric CO2 affect marine organisms?

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North Slope Central Tianshan Mountains, Xinjiang, China
Zhang, Y., Kong, Z.-C., Yan, S., Yang, Z.-J. and Ni, J. 2009. "Medieval Warm Period" on the northern slope of central Tianshan Mountains, Xinjiang, NW China. Geophysical Research Letters 36: 10.1029/2009GL037375.

Based on a multi-proxy reconstruction of climate changes in three Holocene sediment profiles obtained from the Daxigou region, Caotan Lake and Sichang Lake that utilized "pollen, phytolith records, and the data of loss on ignition, grain size, and susceptibility," complemented by "tree-ring records, other pollen records, data of plant seeds and historical documents," the authors determined that "during the Medieval Warm Period (from the middle of the Tang Dynasty to the middle of Yuan Dynasty)" -- which lasted, in their words, "from the ninth to the fourteenth centuries" -- "the climate was humid on the north slopes of Tianshan Mountains."